Dad told this story in a postscript to a longer email having to do with an oil well. I decided to promote it from P.S. status.
Grandaddy graduated from University of Oklahoma in Norman in spring 1939 but could not afford the $10 for his diploma or the rental of a cap and gown. He hitched rides to Austin to be with Grandmother (then known as Ruth) for her graduation.
As it developed, the fellow who was supposed to walk across the stage immediately after Ruth to receive his diploma came down with a fever and could not participate.
Rather than leave an empty seat and have no one walk across the stage when this fellow’s name was called, John Alan arranged to borrow his cap and gown and, wearing these, sat with Ruth, walked across the stage and received the other fellow’s diploma.
He returned the diploma, cap, and gown following the ceremony.
A year later when he ponied up the $10 for his diploma the University of Oklahoma misdated it to show a 1940 graduation date.